In order for kills on GVs or buildings to show in your score (I assume you're talking about killing GVs and buildings in a Jabo role? eg. 190 A8 killing a Flak panzer) you must score these sorties as 'Attack', not 'Fighter'.
In the hangar, when you've selected your aircraft, you will see on the right side underneath the aircraft list buttons that say 'Attack' or 'Fighter'. Click attack.
Killing GVs in 'Attack' mode will show up on your score sheet.
Many people score all of the aircraft that it is possible to score as 'attack' as attack and fly only a few aircraft as 'Fighters'.